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Letters Patent No.' 76,528, dated April .7, 1868.

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'TO ALL WHOM IT MAY ONERN:

Be it known that I, ILLIBL ROBINSON, Detroit, in the county of' `rf/'ayne and State oi' Michigan, have invented anew` and improved Balanced Slide-Valve; and do hereby declare that the' following is a full, clear, and exact description thereof, Fhich 'will enable those 'lledin 'the art to make and use the same, reference being had to the accompanying drawings, forming part et' this specication.

This invention relates to n new and improved-method et' 'packing and balancing the slide-valves of asteamengine, whereby the pressure of the steam on the face of the valve is eounterhalanced and the valve allowed to have a free and easy motiont and the invention Consists in providing packing-hars vand strips oi' peculiar construction, in chambers which are provided with suitable apertures and recesses for the passage of the steam, in combination with springs, asvfill be hereinafter more fully described. I

Figure l represents a vertical transverse section'ot1 the valve, and the parts connected therewith, through the line x x of g. 2.. l

Figure 2 is a top or plan view of the valve'with a portion of the packing-hars removed, showing the recesses in which they are secured, andthe position of the spiral springs which operate upon/them.

Figure 3 i's a vertical longitudinal'section of the valve, showing a cross-section of the end packing-strips, and of the L-shaped bars behind' them, the section being through the line'y y of g. 2.

Similar letters of reference indicate corresponding parts. l

The'steam-ehest, valve-rod, and a portion of the steaui-cylinder are shown in red lines, forv thepurpose of showing the application oi' the valve to better advantage. l

Recesses inthe sides ofthe Valve are formed for the reception of rectangular packing-strips, as seen in iig.

The ends ofthe valve have recesses which contain, in addition tothe same kind of packing-strips, l -slraped bars, in the rebated portions `of which the packing-strips are placed, as seen in tig. 3.

A represents the valve, end B B represent the recesses on the sides of' the valve. t l

C C represent the longitudinal packing-strips, which areplaced loosely in the recesses, and are allowed to have free motion therein.

Beneath these strips C C there are spiral springs, d, or springs of other form, which serve to keep the strips and hars in position2 and in contactwith the top ot' thc valve-chest.

The strips C C are recessed and rchatod, as seen in the drawing, presenting differential surfaces, as seen, for steam-pressure. I

The recesses B B are in free communication with the steam in the chest through the apertures or ports beneath the strips and in the side` :is seen at a a, in the drawing. These `recesses are rihoed, which ribs form.

guides for the strips, as seen at c, a.

From the interior of the valve there are apertures, e, which admit steam into the recesses the strips C,

as seen in the drawing.

The ends of the valve are packed oy a similar arrangement, hut the reco g contain thc' L-shaped bars E E, betere mentioned, the rebate of which contains and supports the pziciingstrips F F, which strips are in form (or in cross-section) the saine as those on' the sides ofthe valve.

The 'oars E, at each'end oi' the valve, are in two pieces, in the ends of which pieces there which arc placed spiral springs for forcing thc pieces asunder, for the purpose of' forming :t sti at their ends against the side packing-pieces C C, :is plainly seen in iig. 2.

The springs (Z, at the ends of ,the valve, are seen nearing against the bars E instead of the strips F. The ports and apertures a ,and e, for the admission of steam into the recesses D, are also seen in .ln addition to the ports or apertures a through the bottom or" the recesses D D and B B, there are orifices for thc passage of steam into the cavities occupied hy the spiral springs, or through the spiral-spring lugs, as

ases D D. on the end of the valve,

seen utf, iig.

The rebated barslimay be dispensed with, and the packing-strips F may lap hy, orbe arranged in any other suitable nanner to form :t steam'joint with the sidestrips at the corners of the valve.

It will he seen that the whole interior of ,a valve formedA in this manner is a recess or chamber for the exhaust steam, which isconsidered un important advantage.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent- The balanced slidevalve, constructed as described, having the perforated side recesses B, adapted to receive the single peeking-strip C,havingdi`erental surfaces, forming recesses, the inner recess communicating with the interior ofthe valve through the openings e, and the ends of said valve having perforated recesses, D, coni taining the double' packing-strips, the inner one, F, of which is formed in one -piece, and the outer one, E, of4

two pieces, held apart by the spiral spring, the recesses in the ring F also communicating with the interior of the valve through the openings e, all constructed, arranged, and operating as herein described, for the purpose specified. i i

WILLIAM B., ROBINSON.

Witnesses:

JEFFERSON WILEY, F. A. H Usssv. 

